electricalscho

The coordinated arrangements for the protection of one or more elements of a power system. A protection scheme may compromise several protection systems.

A relay designed to initiate disconnection of a part of an electrical installation or to a warning signal, in the case of a fault or other abnormal condition in the installation. A protection relay may include more than one electrical element and accessor

An approach limit at a distance from an exposed live part within which work is considered the same as making contact with the live part.

A large transformer, generally larger than 1,000 kVA in capacity.

A mean of transmitting information over a power transmission line by using a carrier frequency superimposed on the normal power frequency.